The Duchess of Cambridge visited an Early Years Parenting Unit (EYPU) in north London run by the Anna Freud National Centre on Wednesday. Kate hands a baby some plastic building blocks as she joins a "theraplay" session, which promotes the attachment relationship between parents and children. /CFP Photo

The Duchess of Cambridge speaks with staff of the EYPU to learn more about its work with families who have children under five years old. /Reuters Photo

The Duchess of Cambridge visits the EYPU with Peter Fonagy (2L), CEO of the Anna Freud National Centre for Children and Families. EYPU offers assessment and therapy for parents with personality disorders with their kids under five years old, who are on the edge of care. /CFP Photo